Improvement in saws



E. HUMPHREY.

SAW.

No. 74,541. Patented Feb. 18, 1868.

EUGENE HUMPHREY, or sosron, MASSACHUSETTS.

Letters Patent No. 74,541, dated February 18, 1868;

IMPROVEMENT In SAWS.

il -ht iitlgnnlc' ninth to in than itntttt 23mm amt muting mitt at flit sane,

TO ALL WHOM IT MAY CONCERN:

Be it known that I, EUGENE Huiurimspnf Boston, in'the' county of Suffolk, and Commonwealth of Massachusetts, hm-c invented a new and improved Mode of Securing Movable-or Insertable and SelF-Adjiisting Sow- Tecth in their Recesses in the Saw-Plate; and I do hereby declare that the following is a. full, clear, andextict description thereof, which will enable others to tuckeand use my invention, reference being had to the accompanying (ll-swings and letters of reference marked thereon, which form n port/of this specification.

In said drawings are shown sections of a. circular saw-plate, in which ore inserted one form of insei'toblc and selfacljusting sow-teeth, to which my invention. isspeciully 'ndcpted, and which tooth was invented and patentedby Joseph W. Strange, of Bnrigoig hlnine,August 13, 1867,":1nd is designed, by its peculiar form, in combination with its recess in'the saw p lnte to be self-fastening, by being "wedged in its plute3by the collision of the cutting-edges of the tooth with the lumber to be sztwedf This tooth is secured from being knocked out by a side'wise blow by having its recess and curved bottom bevelled, but is. removableby a slight blow upon its back, which will throw it out of its plate. 1. seems to me possible that such arreinorgtl of the tooth may occur when the saw is in use by somot' the accidents incident to sawing lumber; and to prevent such a mishap is the object of my sufety-slide or fastening, when applied to said tooth.

It is found, by practical cxperiencc, to'be very desiritble that a. movable, insertable, or adjustable snw tooth should. be so constructed and inserted in its plate as to keep itselfinhcn in use, fiimly fixed in its recess in the plate, adjusting itself thereto in case of any wear, and thus diminish the wear by preventing looseuess of the tooth. Thei'ortu and operation of thetootli shown seem peculizirlyodapted to accomplish this desirable result. It follows, therefore, from-these considcrutions of the proper construction of ansdjustnble tooth, that any device for securing .such' a. tooth in its plate, when in use, should be such that, while it efi ects the desired security of the tooth in' its/plate, it will. not, atthe sometime, interfere with its firmly adjusting itself in its recess by collision with the lumber sawed.

Figure 1 represents a sect-ion of a circular suw-plntc, with o tooth, such as has been referred to, secured therein, means of one form of my new rind improved mode of foste'ning', which consists, in this case, of a slide, 0, of unequal width, working in recesses in the tooth a and plate 6,0 equal or uniformwidth throughout, said slide having grooved sides, fitted-to work in the uniform recesses, 01 nude, in the tooth a end plate 15, which (recesses have bevelled sides, fitted tosaid grooves in' the sides of the slide 0.

When it is desired to remove the tooth a from the plate b, the slide a is pushed wholly into the recess 41 in the tooth a, when, by a. slight blow upon' the backot said tooth in the. direction of the plate 6, the tooth is turned in its recess in the plate, and released therefrom; but, when it is desired to secure the tooth a in its properworking position in the plate, the tooth is plsc edin such position, and then the slide a is pushedpartiolly out of the recess din the tooth into the recess e in the plate, as shown in the drawiug, thus efiecting, by this position of the slide 0, in connection with'the recesses 11 and e, the desired security of the tooth in the sow-plate. At the same time, the tooth is left frceto strain upand adjust itself tightly' in its recess in the plate by collision with the lumber sowed, by reason ofthe change in the width of the slide 0 above tlle'rliue of separation of the tooth 51nd plate, whiches'sential result would be defeated were the said slide a of a unit'oi'm width throughout its whole length. l

Figure 2 represents a section' of a circular-sow plate, with a like'tooth inserted therein, and secured in the plate by means of another form of my new mode offaste'ning, which consists, in'this case, of a slide, a, of equal width throughout its length, workingin substantially the some manner as the slide in fig. 1, but'in recesses in the plate and tooth notof uniform and. equal width throughout, thus effecting, by a. change of width in the recess d in the tooth a, as shown in the drawing, substantially the some desired result of securing the tooth from accidental turning in its plate in the direction which would release it therefromand, at the sometime, leaving it free to strain up tight in its plate by collision witli' the lumber sewed. Itis obvious that the same result may be also attained by cutting ulwc'y or varyingthe width 'of'both the reoe'ssaml's'lide, without materially deviating from the principle of my invention. v

What I claim, and desire to secure by Letters Patent, is

The fastening of u'movablc or insertable and self-adjusting sow-tooth in its recess in the sew-plate by means of a. slide operating in combination with a recess extending into the plate and tooth, substantially b5 described, when said slide or recess, or both, are cutuwey'orvaried in width, for the purpose described.

EUGENE HUMPHREY.

Witnesses:

CBARLES ELEM, D. W. G. Humrmmr. 

